Can a Blunthead Wrasse Live With a Pencil Urchin?
✗ Not recommended in most tanksVerdict from our compatibility engine, assuming a typical 90-gallon reef tank. Score: 0/100.
Why
- Known conflict: Thalassoma wrasses eat ornamental shrimp and small motile inverts
- Reef safety hard block: Not reef-safe — Pencil Urchin will damage coral/inverts
It can work if…
- Upgrade to a larger tank — this species needs more volume
- Known incompatibility — these species are documented to conflict
- Reef safety concern — relocate or rehome before adding to a reef tank
Both species at a glance
Blunthead Wrasse
Thalassoma amblycephalum
- Aggression:
- semi-aggressive
- Min tank:
- 100 gallons
- Reef safe:
- safe
- Diet:
- carnivore
Pencil Urchin
Eucidaris tribuloides
- Aggression:
- peaceful
- Min tank:
- 30 gallons
- Reef safe:
- unsafe
- Diet:
- omnivore